[1] Max Planck Inst Evolutionary Anthropol, Dept Primatol, Deutsch Pl 6, D-04103 Leipzig, Germany
[2] Robert Koch Inst, Project Grp Epidemiol Highly Pathogen Microorgani, Seestr 10, D-13353 Berlin, Germany
[3] Ctr Suisse Rech Sci, Tai Chimpanzee Project, BP 1303, Abidjan 01, Cote Ivoire